Autogeneous TIG pic

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In the past couple of days, there has been alot of questions about TIG welding without added filler metal.  At the bottom of this are links to O.D. and I.D. photos of an autogeneous TIG weld on stainless steel tubing.Stainless steel tube welding is one very common application that done by machine autogeneously.  Here is one example of tube weld.  In this case the tube was rotated and the torch was fixed, but in portable tube weld systems used in field installations, the tungsten inside the weld head rotates around the tube joint.Joint preparation and fit-up must be excellent.  The tube ends must be machined square and if any deburring is done, care is taken not to round-off or chamfer the I.D. or O.D. edges of the tube end.  The tube ends are butted together snuggly with no joint gap.It is also important that the arc length be very tight (0.030 to 0.045") and very consistent around the joint, and that the tungsten be finely ground and sharp.  A precise and concentrated arc gives the best results.This is a mechanized pulsed TIG weld on 0.027" thick, 1.25" dia., 304L SS tubing. Peak current = 41 amps, sloped to 38 amps over 360 degrees.Background current = 20% of Ipk (8 amps)Calculated average current = 14.7 to 13.7 ampsPeak time = 0.053 sec.Background time = 0.213 sec.Travel speed = 6.4 inch/min.Calculated frequency = 3.8 pulses/sec and 35 pulse/inchTungsten 2% Thoriated, 3/32" diameter, 30 degree included angle to sharp point.Tip-to-work distance = 0.045", maximum run-out = 0.005"Position = joint horizontal, rotated (2G)Purge gas = Helium filled chamber, less than 10 ppm O2 & H2O.Torch gas = Argon, 8 cfhWeld is full penetration, 0.090" wide outside and 0.060" wide inside.http://i94.photobucket.com/albums/l1...ds/PGTAWOD.jpghttp://i94.photobucket.com/albums/l1...ds/PGTAWID.jpgLast edited by pulser; 11-30-2007 at 11:11 AM.
Reply:just for a clarification of terminology, autogeneous welding is TIG welding with no filler correct? also, does anyone notice that although it is SS, there is NO discoloration, except in the HAZ? no oxidation leading to "pretty colors".Later,Andy
Reply:Originally Posted by aczellerjust for a clarification of terminology, autogeneous welding is TIG welding with no filler correct? also, does anyone notice that although it is SS, there is NO discoloration, except in the HAZ? no oxidation leading to "pretty colors".Later,Andy
Reply:How did you get pictures of my welds???
Reply:Originally Posted by WANNAWELDHow did you get pictures of my welds???
Reply:Nice pics pulser.. ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Yes, some great looking welds. BUT, why is it such a big deal to some of you that we don't all call it by it's real name when some of us can't even pronounce it ?? LOLAnything worth doing is worth doing RIGHT
Reply:Looks good, what orbital unit do you run?  I'll have to grab some of the samples from our Magnatech unit to throw up.
Reply:Originally Posted by SupeLooks good, what orbital unit do you run?  I'll have to grab some of the samples from our Magnatech unit to throw up.
Reply:You're killing me with the perfect weld pics. Thanks for making me realize I still suck....... yeah, I know it was a machine, with a positioner, but Jeezus, that is too nice.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:Originally Posted by RojodiabloYou're killing me with the perfect weld pics. Thanks for making me realize I still suck....... yeah, I know it was a machine, with a positioner, but Jeezus, that is too nice.
Reply:Rojodiablo,Thanks, it is cheating with a machine, but still takes quite a bit of playing around (technically called welding parameter development) to get everything just right for the machine to make the same weld, over and over again.  It's tough work, but someone has to do it.Surely not as satisfying as making the ultimate weld by your own hand, but still alot of fun.I do some manual welding, and I allways think about getting the best joint fit-up I can, and getting comfortable so I move smoothly and consistently along the joint, like a machine.  I get the impression that it is not obvious to many beginners, that you have to hold constant arc length, current, travel speed, and wire feed to make a pretty weld.
Reply:Originally Posted by zapsterLooks like it's about time you got a positioner Paul.. You'll never regret it either.. ...zap!
Reply:Originally Posted by pulserI'd like to see what you're doing with the Magnatech.These welds were done with a positioner.  The torch was fixed horizontal and the part was rotated in the 2G position.  Have not had the opportunity to work with orbital tube weld heads for quite some time, every thing I do these days is fixtured to rotate the part.  TIG, MIG, Plasma, EB.My first job out of college was with Dimetrics, now called Liburdi Dimentrics.They still make some great orbital equipment.
Reply:What kind of Orbital Machines are you guys using?
Reply:Heres one, I forget the exact machine parameters but it was 5g, J-prep 1/16 land closed root. 2" sch80Have we all gone mad?
Reply:I hear autogenous mispronounced all the time, sp if anyone is curious how to pronouce "autogenous" ...........I beleive it's like this  > .....with the accent on the 2nd syllable (the "tah" sound.)
Reply:Originally Posted by pulser............questions about TIG welding without added filler metal.  ..........